Dobby pattern chain cylinder



Feb. 10, 1953 w. E. LUNDGREN 2,627,879

mossy PATTERN CHAIN CYLINDER Filed Feb. 7, 1950 2 Sl-lEETS-SHEET l Fial INVENTOR Mu MMEL uA/aazf/s/ BY I g ATTORNEY Feb. 10, 1953 Filed Feb. 7. 1950 w. E. LUNDGR EN DOBBY PATTERN CHAIN CYLINDER 2 SHEETS-SHEET 2 PF-K 32,

INVENTOR Mu/m/fluvfiaezw BY 2; 2 @ATTQRNEY Patented Feb 10, 19.53;

UNITED STATES PATENT OFFICE HOBBY PATTERNCHAIN CYLINDER A WilliamE. Lundgren, Sharon, Mass.

ApplicationFebruary 7, 1950, Serial No. 142,804

r This inventionrelatesto dobby mechanismsof the type employing pattern chains comprising 'linkedbars anchmore particularly, to an improvedconstruction of pattern chain cylinder whereby it may be made of differentlengths to accommodate pattern chains of the difier'ent widths presentlyin-use. v l I Pat tern chain cylinders are employed in conjunction with the harness motion of dobby looms and-cooperate with 'a chain-like arrangement of perforated woodenbars carrying numerous upstanding metal pattern indicating pegs placed inuselected holes in pattern determining positions'to form one or more rows on the bars. The bars 'are moved by the pattern cylinder to advance and feed the pegs into contact with pattern reading fingers whenever there is a pick, thereby. causing the fingers to be moved upward at predetermined intervals. This action lowers the usual jack hook in the path of a movable knife which, in its forward motion, catches onto the hook and pulls the jack and the harness lever into raised positions to lift the harness frame. Thus, a desired-pattern is woven on the loom.

Pattern chain cylinders normally have been made of an all-wood construction, turned and cut from a single block of wood, and having a frusto-conical flange at each end and a longitudinally toothed or grooved body portion intermediate of and spaced from the integral end flanges to accommodate and support the bars of the usual pattern chain. 'It is found from practical experience that such ordinary all-wood unitarytype of. cylinder construction does not give entire satisfaction because of many reasons amongwhich isits short life due to the rough handling which it receives and to the readyitendency of the .wood to splinter, crackor warp; Furthermore, such wooden cylinders when manufactured'in quantity on a mass production scale are found to lack dimensional accuracy and uniformity due to variations in grain structure and ununiform seasoning of the Wood. ,1t is, therefore, one objectof the invention to provide a dobby pattern chain cylinder of a simple accuIate and durable construction fabricated of rigid molded organicplasticshapes which will avoid not only the foregoing disadvantages of the conventional all-wood type of cylinder but also will dispense with machining operations. to efct t ha e, avelon er. life than thelconventional wood cylinder, and be economical tomanufacture. 1

Another object oiithe invention is to providega fabricated dobby pattern chain cylinder built 12 Claims. (Cl. 139-330) up of aseries of aligned hollow} cylinder sections formed of rigid molded organic plastic shapes in which theconstruction will be such that it will permit the building f'ofv cylinders of various lengths and gauges, using a minimum of different types of molded shapesudesignedto form a cylinder assembly having'notched end flanges and a longitudinally grooved intermediate body portion respectively receiving the ends a'ndthe der of a sectional construction built up of a series of aligned hollow cylinder, sections which will permit the repair of one or more sections byf the removal thereofand replacement with anew'section or sections should serious damage of cylinder be incurre 1 A still further object of the invention'is the provisionof a fabricateddobby pattern chain cylinder of a sectional constructionbuiltup. of a series of individual roll members located end'to end and joined together for commonunitary ro-.'.

tative movement, in whiclrthe joints between the ends of adjacent roll sections are arranged to have detachable interlocking, lelationship.,f

In its "broad aspects, the improved cylinderiof my invention comprisesa shaft on the ends; of which are fitted toothed or notched flanges" of a rigid molded organicplasticbetween which'a id spaced, therefrom-by a hub connector member'is a toothed body portion built up of a series of aligned hollow cylinder sections formed of a rigid molded organic plastic arranged end tolen'd in substantially abutting relationship on the shaft thereby. providing a fabricated cylinder. The,

notched end flanges and intermediate "body see:

,tionsforming the toothed barrelof thecylinder each present at their j adjoining" and abutting" ends key elements which are formed to inter1-lt' and interlock one with the otherwhen' the adjacent cylindersections are assembled thereby providing a coupling arrangement between the sections assuring positive rotation of: all theparts' in unison, the keysbeing angularly positioned with respect to the ends of the adjacent sections" so that they cooperate to effect the linearialigri ment of the chain bar. receiving groovesof ll sections making upthe cylinderbody proper as wellas aligning therewithithel'notchesg'of the'e'nd I a ta V, iii. iv... a." .i. we: ,Thefnature of the invention will be" readily understood fromthe following description when read in connection with the accompanying drawlugs, and the novel features will be particularly pointed out in the appended claims.

In the drawings:

Fig. 1 is a side elevation of a portion of a dobby mechanism with the front dobby side partially broken away to show a. clear view of the fingers and hooks, and showing the application of a pattern chain cylinder embodying my invention;

Fig. 2 is a side elevation, partly in section, of a dobby pattern chain cylinder constructed in accordance with my invention and showing portions thereof broken away and in section to show the interlocking key members detachably connecting the adjacent parts joined together at their ends to provide a unitary cylinder organization;

Figure 3 is a vertical sectional view taken on the line 3-3 of Fig. 2 and looking in the direction of the arrows;

Fig. 4 is an exploded perspective view showing the manner of assembling the various sections on a shaft to form a cylinder, and before the sec-- tions have been compressed together end to end into substantially abutting relationship;

Fig. 5 is a detailed perspective view of one of the toothed or notched end flanges;

Fig. 6 is a detailed perspective view of one of the toothed or grooved intermediate sections employed for fabricating the body portion of the cylinder;

Fig. 7 is a side elevation of a modified form of dobby pattern chain cylinder which is similar in general construction to that shown in Fig. 2. but diifers therefrom as to details of the key connector joint, and to length whereby it is adapted for driving and supporting a pattern chain having longer bars;

Fig. 8 is another modified form of dobby pattern chain cylinder in which the main body portion thereof is composed of a series of individual toothed cylinder members and cylindrical spacer members alternately disposed on a shaft end to end in substantially abutting relationship and detachably connected by interlocking keys integral with the respective parts;

Fig. 9 is a detailed perspective view of one of the cylindrical spacer members employed in the construction of the cylinder shown in Fig. 8; and

Fig. 10 is a vertical section taken on line l! 0 of Fig. 3 and looking in the direction of the arrows.

In' Fig. 1 of the drawings a portion of a dobby frame F is shown with a rocker arm l2 pivoted as at 13 and having connection with a depending driving rod M which may be raised every alternate pick of the loom and depressed on intervening picks. The upper lifting knife I is attached by means of a connector IE to the upper arm I? of the rocker arm l2. Similarly, the lower lifting knife I8 is attached by means of a connector IE to the lower arm (not shown) of the rocker arm l2. These knives cooperate with hooks 20 and H respectively which are attached by means of jacks indicated herein at 23 to the harnesses (not shown).

The lower hooks are governed by means of fingers 24 which have upturned ends 25 for direct engagement with said books. The upper hooks 20 are controlled by dobby needles 26 which are operatively connected to other fingers 27. Every alternate finger will be of the type designated at 24 while the intervening fingers will be of the other type. A pattern surface 28, which is here shown as the pegged chain 29, on the rotating pattern chain cylinder 30 controls the rising and falling of the fingers 24 and 21 and through connections described determine the position of the hooks relative to the knives. The mechanism thus far described, with the exception of the cylinder 39, is of common construction and forms no part of the present invention, being made and operating in the usual and well-known manner.

The improved dobby pattern chain cylinder 30 of the present invention and shown in Figs. 1 to 6 inclusive is of a fabricated construction built up of a series of individual shapes of rigid molded organic plastic composition detachably connected end to end for common rotative movement. As shown here, the cylinder 30 comprises a shaft 3| having a pair of toothed or notched spaced flange members 32 one located at each end portion of said shaft and secured thereto, and a main body portion built up of a series of toothed or longitudinally grooved aligned body sections 33 which are disposed intermediate the flanges or end members 32, the ends of adjoining body sections being in substantially abutting relationship with each other. The shaft 3! extends through the end members 32 and the body sections 33. Each of the body sections 33 are hollow, being of generally cylindrical form interiorly with a cylindrical passage therethrough and provided at the ends with semi-cylindrical keys 35 and 35" respectively which are positioned at diametrically opposite sides of the shaft 31 and thus bear an angular relationship with respect to each other of As illustrated particularly in' Fig. 6, the keys 35 and 35' each consist of semi-circular discs of rigid molded organic plastic composition and the ends of the body sections 33 have an enlarged cylindrical recess as indicated at 36 to provide an inner annular shoulder 37 against which the inner end faces of the keys 35 and 35' abut when fitted in place in the respective enlarged recessed ends of the body sections -133 and joined integrally therewith by a cementing or adhesive binder suitable for plastics. The keys 35 and 35' each project outwardly from the ends of the particular sections 33 to which they are afiixed, and each key presents a semi-cylindrical central shaft bearing in its flat diametrical face which half bearing openings at the opposite ends of the same body section 33 are angularly disposed 180 with rcspect to each other and engage opposite sides of the shaft 3! to position and support the body member 33 on the shaft 3| in substantially coaxial relationship therewith. The semi-cylindrical keys 35 and 35' of the adjacent body members 33 fit tightly into the semi-cylindrical openlugs 38 complementing the keys 35 and 35 at the respective ends of the body sections 33 and in abutting relation with the'shoulder 31 while the flat diametrical faces of both keys connecting adjacent sections have firm engagement with each other when the parts are compressed together to form the complete cylinder.

The outer periphery of each flange member 32 is toothed or notched as indicated at 40 to provide circumferentially therearound a series of outwardly opening chain bar receiving sockets which are open at the top and one end, and have aeveled sides and inner ends to correspond to the bevel on the sides and on the end of the pattern chain bars. The sockets 40 accommodate and support the ends of the bars and prevent them from lifting whenever the end pegs carried thereby are in contact with the pattern reading fingers of the loom dobby.

The end flanges 32 each are formed with a cylindrical hub portion 41 of smaller diameter than the notch-carrying part of the flanges, and this hub has projecting at its outer end a semicylindrical key 42. Extending through the hub 4| and the flange-member 32 is an axial hole 43 of a size for snugly fitting the shaft 3!. The 'key 42 is molded integral with the hub 4| and is accurately molded both in shape and size so as to tightly fit into' the semi-cylindrical opening 38 at the end er the adjacent body section 33 and have detachable interfitting locking engagement 'with the key 35 or 35' associated therewith. The

axial length of the key 42 is made such that the diametrical flat faces 4'! thereof will have substantially full bearing engagement with the corresponding flat diametrical faces 48 of the keys 35 and 351': whenlthe respective keys have interfitting relationship and are locked one with'the other in the assembled cylinder.

In use of my cylinder 30, as shown in Fig. 1, the pattern bars of the chain 29 extend lengthwise of the cylinder 30 between the two end flanges 32 with the opposite ends of the bars supported in the outwardly opening sockets or notches 40 of the respective flanges 32, and the body portion of the bars occupying the outwardly opening peripheral grooves or slots extending the entire length of the main body portion of the cylinder and formed by spaces 45 of the aligned toothed body sections 33. i

To assemble. my pattern chain cylinder, one of the end flanges 32 is first applied over an end of the shaft 3i and pinned in place thereon by means of alcylin'drical pin 44 (see Fig. which extends diametrically through the hub M of the flange 32 and the shaft 3|. The diametrical hole in the hub 4| receiving the pin 44 either may be drilled therethrough at the time of assembly or it may be provided in the hub 4| priorto assembly of the cylinder parts. A series of toothed body sections 33 then are applied over the opposite end of the shaft 3! and slid along toward the fixed flange 32 while at the same time being manually rotated on'the shaft by the assembler so as to bring the keys 35 and 35' of adjacent sections 33 into confronting positions with the semi-cylindrical openings 38 of the respective sections 33 and thereby to enable the keys to be forced into these openings and in an abutting relation with the respective annular shoulders 31 thereof when the flanges 32 and the sections 33 are compressed together end to end and the keys 35 and 35' interlocked with each other. Similarly, the first applied section 33 is turned to permit the key 42 of the flange 32 to enter into the opening 38 and become interlocked with the mating key 35 of the adjacent and first applied body section 33. The other flange 32 is then applied onto the shaft 3! after the required number ofltoothed body sections 33 has been then pinned in position thereto byv a second pin .45..

It is to be "understood that the diametrically disposed parting fiat faces 48 of each of the semi-" cylindricalkeys 35 and 35' must be disposed so as to lie in a .plane coincident with the longitudinal axial plane passing midway through each of the two fdiamet'rica'lly opposite tooth-spaces 45 of each of the "body members 33 (see Figs.

2 and 4). Similarly, the diametrical parting faces 4'! of the keys 4! of each of the end flanges 32 must be disposed so as to lie in a plane coincident with the longitudinal axial plane passing midway through each of the two diametrically disposed chain bar sockets 40 of the flanges 32 (see Figs. 2, 3 and 4). Thus, it will be seen that when the end flanges 32 and the body sections 33 are joined together by their respective keys 35, 35' and 42 to form'a' complete cylinder the toothed spaces or grooves 45 of the body sections 33 and the notches 40 of the flanges 32 will be accurately aligned longitudinally of the cylinder oo-provide grooves for the accommodation andtheproper positioning and support of the pattern chain bars. It is feasible also that the keys Hand 35' could be separate elongated keys tongued into complementary recesses or notches formed in'the 'ends of the body sections 33 and need not be cemented in place therein. r

In' the modification 'shownin Fig. 7 the end flanges 50 are comp osedpf ri'gid 'rnolded organic plastic material- -and"shaped"; similar to "those employed in the Fig. cylinder construction but the Fig. 7 arrangement differs therefrom in that thetcylinder'is built up on th'e'shaft 5| of a greater number of toothed body sections 52 to providea body portion of: greater length adapted for supporting" and'feedinga wider pattern chain. The toothed body sections--52'-'each'are formed of a :rigid: molded organic plastic material with the semi-cylindrical keys-:53 and [531st their opposite endsbeing molded integral with the body sections and compose'd of the same organic plastic composition. It will be understood that this modified form' of cylinderconstruction will be .assembled'on 'the' shaft {i l in the same' man ner as: that practicedin' assembling the flanges and roll sections 1amthe shaft 3I"-to form the Fig.2.cylirider;

In themodifi'catiorijsh'own n Fig.3 the body portion'of the cylinder "is built up on the shaft 60 of alternate toothed body sections, fil and cylindrical spacer section's'B'Z-I II Ii misconstruetion the toothed body i'nember's-fil and the spacer sections 32 each have-semb'cylindrical keys 63 and- 63' respctively 'a't-their opposite ends but the'Fig. 8 cylinder cpnstruction' differs from that of 'th'eFig. 2' form; in th'at the keys 63 and 33' instead of being'formed as separate plastic pieces cemented in place within; theqountei'b'ored and shouldered ends -of;the body 'sections 33, as is the case withthe keys 3'3 -a nd 35, are molded integral with the wallsoi "the sections 6! "and 62 respectively. 5 The cylindrical spacer sections 62 are of less outerldiameter than the root diameter of the toothed spaces or grooves 63 of thetoothed body sections Stand are here shown as having an outer diameter substantially that of the hub fis of the end flanges 63 which are identical; with the flanges 32.; This modified form ofcylinder; is assembled in the same nannei as the Fig, 2{construction previously described. The Fig; 8 cylinder construction has the? advantage "-thajt -by-the useof small diameter spacers-"62 less plasticrriolding' material is required in its manufacture-so. thatit will be much less-costly to build than e-ithenthe-Fig. 2 or Fig.

'2 constructions. a

The organic plastic molding material of which the -'-"rlgid 'nidlded'plastiefianges 32-F 5B and 37 and the respective body sections 33, 52, N and 32, as well astheir associated-keys, may be formed,

may vary in nature and have different thermal; mechanical, and chemical properties, such as tensile and compressive strengths, toughness, shock resistance, flow characteristics, etc, so that various different organic thermoplastic and thermosetting plastic molding compounds may be used toproduce these rigid molded plastic shapes having desirable properties for application to the construction of the plastic members of the foregoing pattern chain cylinders in accordance with the invention. As one example of a satisfactory plastic molding material I have made cylinders of the foregoing constructions using cellulose acetate butyrate, which is an organic thermoplastic material, having the following properties: 2500- 7500 p. s. i. tensile strength, an Izod impact strength of 0.8-5.5 ft. lbs. per in. of notch x in. notched bar, a Erinell hardness of 6-12 with a 2.5 m. m. ball and a 25 kg. load.

Cellulose nitrate (Pyroxlin) having the following properties: 6000-8000 p. s. i. tensile strength, a Charpy impact strength of 4-6 ft. lbs. per inch of notch and a Brinnell hardness of 8-11 with a 2.5 m. m. ball and a 10 kg. load, also is a suitable material for forming the end flanges and roll sections which are used in my cylinder construction. I have also made a test cylinder of laminated phenol-formaldehyde material with a cotton fabric base which had the following properties: tensile strength of 10,000 1). s. i., a Charpy impact of 15.8, a Rockwell M scale hardness of 102, and a moisture absorption factor of 2.5 percent increase in weight (for a thickness of .125 inch). with Westinghouse laminated Micarta, grade #262, the mechanical and physical properties, characteristics and recommended design applications of which are set forth in tabulated form in the 1950 edition of Sweets File of Manufac turers Catalogs for Product Designers, section 112/17, pages 4 and thereof. The word Micarta is the registered trade-mark for a highpressu-re laminated plastic material made by Westinghouse Electric and Manufacturing Corporation,

of Durez Plastics and Chemicals, Inc, North Tonawanda, New York, used to designate their make of phenolic molding compounds and types of phenolic resins.

Rigid molded plastic shapes formed from the above-mentioned plastics have the following general characteristics: excellent dimensional stability, high resistance to shrinkage and distortion under varying of temperature and humidity, low moisture absorption, high impact strength, and improved surface finish.

From the foregoing it is thought the merits and advantages of this invention will be clearly apparent, but it is desired to stress herein the fact that because of the excellent dimensional stability and accuracy to which plastic shapes may be molded, uniformity of product is insured on a mass production scale. Furthermore, the improved construction permits the use of thin walled sections and manufacture by use of only a few small dies. Also, the improved cylinder Such a material compares 8 arrangement permits the. intermediate sections forming the cylinder body proper to be made either of the same or difierent widths to provide a cylinder of the proper length to cooperate with the various standard chain bar lengths or gauges in use.

It will be observed from the foregoing specification that the present invention provides a novel form of dobby pattern chain cylinder which is of simple, accurate, relatively light weight and durable construction to adapt it for economical manufacture. It also will be seen that the sockets or notches in the end flanges support and cooperate with the ends of the bars of the pattern chain to prevent them from becoming dislodged or lifted from the grooves in the cylinder body proper whenever a pattern peg set near the ends of the bars is brought into a pattern indicating position with respect to the dobby fingers.

While several forms of construction of the improved cylinder are herein illustrated and described, it is to be understood that further different modifications may be made in the form and arrangement of its parts without departing from the spirit and scope of the invention. Therefore, without restricting the invention in this respect save as set forth in the appended claims, I claim:

1. In a loom dobby, the combination of a pattern chain cylinder comprising a main cylinder part having outwardly opening chain bar receiving grooves and formed of a series of sections located end to end, each of said sections being composed of rigid molded organic plastic material, and a pair of end members also formed of rigid molded organic plastic material each having outwardly opening chain bar receiving recesses, the adjacent sections having detachable interlocking connection one with the other and with the adjacent end member respectively whereby all of said sections and said end members are connected for common rotative movement in unison and alignment of said chain bar receiving grooves and recesses in said cylinder part and said end member respectively is secured.

2. In a loom dobby, the combination of a pattern chain cylinder comprising a main cylinder part having outwardly opening chain bar receiving grooves in its periphery and formed of a series of sections located end to end in substantially abutting relationship, each of said sections bein composed of rigid molded organic plastic material, and a pair of end members also formed of rigid molded organic plastic material each having outwardly opening chain bar receiving recesses in its periphery, said end members and said sections being formed respectively at their adjacent ends with cooperating coupling elements arranged to have detachable interfitting locking engagement whereby the ends of the adjacent sections and the adjacent ends of the end sections and the end members are connected together for common rotative movement in unison and alignment of said chain bar receiving grooves and recesses in said cylinder part and said end members respectively is made certain and maintained.

3. A dobby pattern chain cylinder comprising a shaft, flanges at theends of said shaft, a cylinder proper built up of a series of sections arranged end to end in substantially abutting relationship on said shaft, and joints between said sections and said flanges detachably connecting the adjacent sections at their ends and locking 9 them together for unitary rotative movement, each of said joints comprising a pair of coacting semi-cylindrical keys interposed between the ends of two adjoining body sections or a body section and a flange, said keys being located 180 to each other on opposite sides of said shaft and interlocking one with the other, and said body sections having a cylindrical passage axially therethrough the ends of which present an enlarged cylindrical recess in which both semicylindrical keys fit when the ends of two adjoining sections are in abutting relationship, one of said keys being affixed to the, end of, one section and the other key forming the'interlocking joint being aflixed to the adjoining-section; 1 V

4. A dobby pattern chain cylinder comprising a shaft extending axially of the, cylinder, toothed flanges at the ends of said shaft adapted to receive and support the ends of the bars of a pattern chain, a cylinder proper built up of a series of aligned hollow toothedgbody section's arranged end to end in substantially abutting relationship on said shaftintermediate said toothed flanges, and interlocking means between said sections and between said flanges and said sections detachably connecting the adjacent body sections at their ends and theinner end of a flange and the adjacent end of an end body section respectively locking them together; for unitary rotative movement, each of saidcoupling means comprising a pair of coacting semi-cylindrical keys interposed between the ends of two adjoining body sections or a body section and a flange, each cooperating pair of keys being located 180 to each other on opposite sides of said shaft andhaving diametrically disposed coupling faces interlocking one with the other, said flanges, body sections and keys each being formed of rigid molded organic plastic material, and said keys being integral with the walls of said body sections and said flanges respectively and having their interlocked coupling faces all of the same angular disposition to maintain the toothed portions of said flanges and of said assembled body sections aligned.

5. In a loom dobby, the combination therewith of a fabricated dobbypattern'cylinder fora dob-=' by chain incorporatingilinked bars, comprising a main cylinder member having'outwardly opening chain bar receiving grooves in its periphery, and a pair of end members one at'each end of said cylinder member-and connected thereto for rotative movement in unison therewith, said end members each having outwardly opening recesses in its periphery aligned with the chain bar receiving grooves in said cylinder member to receive and support the ends of the chain bars when the latter are received by chain bar receiving grooves in said cylinder member.

6. In a loom dobby, the combination therewith of a fabricated dobby pattern cylinder for a dobby chain incorporating linked bars, comprising a main cylinder member having outwardly opening chain bar receiving grooves in its periphery, a shaft extending axially through said cylinder member, and a pair of end members one at each end of said shaft for rotation therewith, each of said end members having outwardly opening chain bar receiving recesses in its periphery aligned with the chain bar receiving grooves in said cylinder member to receive and support the ends of the chain bars whenever the latter have their body portions accommodated within chain bar receiving grooves of said cylinder member, said end members being connected with the cylinder member in an interlocking 10 fashion the arrangement of which is such that it will effect and insure alignment of the chain bar receiving grooves in said cylinder member with the chain bar receiving recesses in the end members as well as cause the cylinder member to turn with the end-members when the shaft is rotated about its axis.

'7. In a fabricated dobby pattern cylinder for a, dobby chain comprising linked bars, amain cylinder member having outwardly opening chain bar receiving grooves in its periphery, and a pair of end members one at each end of said cylindermember and connected thereto for rotative movementzin unison therewith, said end membersfeach having outwardly opening recesses in itssperiphery aligned with the chain bar ,receiving Lgroovesin said cylinder member to receive and support the ends of the chain bars wheneverthe latter have their body portions received by chain bar receiving grooves in said cylinder member.

8., In a fabricated dobby pattern cylinder for a dobby chain comprising linked bars, a main cylinder, member having outwardly opening chain bar receiving grooves in its periphery, a shaft extending axially through said cylinder member, and a pair of end members one atreach end of said cylinder member and secured to said shaft for rotation therewith, each of said end members having outwardly opening chain bar receiving recesses in its periphery aligned with the chain bar receiving grooves in said cylinder memberto receive and support the ends of the chain bars whenever the latter have their body portions accommodated within chain bar receiving grooves of said cylinder member, said end membersubeing, connectedwith said cylinder memberlin an interlocking fashion the arrangement ofwhich is such that it will effect and insurealignment of the ,chain ,bar receiving grooves in said cylinder member with the chain bar receiving recesses in. theendmembers as well as cause'the cylinder'member to turn with the end members when the shaft is rotated about its axis. v.

9. In afabricated dobby,,pattern cylinder for a dobby chain comprising; linked bars, (a. shaft extendingaxially-of' the cylinder, a pair of spaced end members each having outwardly opening recesses in its peripheryadaptedrto receive and support the ends of the bars of the pattern chain, means securing said end members to said shaft for rotation therewith and also preventing their movement lengthwise of the shaft, a main cylinder member disposed about the shaft intermediate the end members and having outwardly opening longitudinally extending grooves in its periphery adapted to receive the body portions of the bars of the pattern chain, the chain bar receiving recesses in said end members being aligned with the chain bar receiving grooves in said cylinder member, and pairs of interlocking coupling members one pair between the inner end of each end member and the adjacent end of said cylinder member for causing the cylinder member to turn with the end members when the shaft is rotated about its axis, said pairs of interlocking coupling members having cooperating coupling faces disposed at such angular relationship on the ends of the cylinder member and the associated end members as to effect and maintain alignment of the chain bar receiving recesses of the end members with the chain bar receiving grooves of the cylinder member as well as function as a drive for the cylinder member by the end members when the latter are rotated by the shaft.

10. In a fabricated dobby pattern cylinder for a dobby chain comprising linked bars, a shaft extending axially of the cylinder, a pair of spaced end members each having outwardly opening recesses in its periphery adapted to receive and support the ends of the bars of the pattern chain, means securing said end members to said shaft for rotation therewith and also preventing their movement lengthwise of the shaft, a main cylinder member disposed about said shaft intermediate the end members and having outwardly opening chain bar receiving slots, said cylinder member being. formed of a series of axially aligned hollow cylinder body sections, and interlocking coupling means between adjacent cylinder body sections and also between each of said end members and the adjacent end cylinder body section, the interlocking parts of said coupling means in each of such locations having such angular relationship to each other, to the adjacent cylinder sections, and to each end member and its associated end cylinder section as to effect and keep the chain bar receiving recesses in said end members and the chain bar receiving slots in said cylinder member in alignment as well as cause the cylinder member to turn with the end members when the shaft is rotated about its axis.

11. In a fabricated dobby pattern cylinder for a dobby chain comprising linked bars, a shaft extending axially of the cylinder, a pair of spaced end members each having outwardly opening recesses in its periphery adapted to receive and support the ends of the bars of the pattern chain, means securing said end members to said shaft for rotation therewith and also preventing their movement lengthwise of the shaft, a main cylinder member disposed about the shaft intermediate the end members and having outwardly opening longitudinally extending chain bar receiving grooves in its periphery axially aligned with the chain bar receiving recesses in said end members, said cylinder member being formed of a pluralityof axially aligned hollow thin-walled cylinder body sections each having a toothed periphery, and interlocking coupling means between the adjacent ends of adjoining cylinder body sections and also between the inner end of each end member and the adjacent end of an end cylinder body section eifecting alignment of the toothed peripheral portions of said cylinder sections with each other and with the chain bar receiving recesses in said end members as well as causing the cylinder member to turn with the end members when the shaft is rotated about its axis.

12. In a fabricated dobby pattern cylinder for a dobby chain comprising linked bars, a shaft extending axially of the cylinder, a pair of spaced end members each having outwardly opening recesses in its periphery adapted to receive and support the ends of the bars of the pattern chain, means securing said end members to said shaft for rotation therewith and also preventing their movement lengthwise of the shaft, a main cylinder member disposed about the shaft intermediate the end members and having outwardly opening chain bar receiving recesses in its periphery axially aligned with said outwardly opening chain bar receiving recesses in said end members, said main cylinder member being formed of a series of alternating aligned toothed and plain cylinder body sections in which arrangement the end and middle cylinder sections are toothed, and interlocking coupling means between the adjacent ends of adjoining cylinder body sections and also between the inner end of each end member and the adjacent end of an end cylinder body section effecting alignment of the toothed peripheral portions of all such cylinder sections with each other and with the chain bar receiving recesses in said end members as well as causing the cylinder member to turn with the end members when the shaft is rotated about its axis.

WILLIAL/I E. LUNDGREN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 609,638 Tymeson Aug. 23, 1898 1,145,677 Gordon July 6, 1915 1,506,890 Duncan Sept. 2, 1924 1,532,600 Mossberg Apr. 7, 1925 1,793,722 Smith et a1. Feb. 24, 1931 2,282,156 Benes May 5, 1942 2,404,237 Krizan July 16, 1946 2,612,189 Blanchard Sept. 30, 1952 

